Speak positively or remain silent when witnessing something.

This hadith emphasizes the importance of speaking positively or remaining silent when witnessing something. It is narrated by Hisham that Prophet Muhammad said that whoever believes in Allah and the Hereafter should talk in good terms about what they witness, or else remain quiet. This hadith teaches us to think before we speak, and to always strive for positive speech even if we disagree with what we are witnessing. We must remember that our words have power, so it is important to use them wisely and not spread negativity through our speech.